Use logic, feats, and stats.
Assume firepower and shields are equalized.
The First Order has StarKiller.
The Covenant have High Charity.
The galaxy's are merged. Covenant on one side, First Oder at the other.
Both at their peaks.
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Logic? Hmmm....ground combat, covenant but with space battles? Definately a star destroyer using Empire. And smaller ships as well. Seraphs and Banshee's ain't got nothing on TIE's. They're just too fast for any halo ship the covenant uses.